NEC PD75402A - Manual (Page 83)

72
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Fig. 5-24 Serial Interface Block Diagram
Internal Bus
8 8 8
Bit
Test
CSIM
P03/SI
P02/SO/SB0
P01/SCK
Slave Address
Register (SVA)
Address Comparator
Shift Registe (SIO)r
Bus Release/
Command/Ac-
Knowledge
Detection
Circuit
Serial Clock
Copunter
Serial Clock
Control
Cirucit
INTCSI
Control
Circuit
Serial
Clock
Selector
External
SCK
INTCSI
(IRQCSI
Signal
Setting)
f xx /2 4
Busy/Ac-
Knowledge
Output
Circuit
SO
Latch
CMDT
RELT
Match
Signal
SET CLR
D Q
Bit Test
SBIC
Bit
Manipulation
(8)
(8)
(8)
RELD
CMDD
ACKD
Selector
ACKT ACKE BSYE